System for extracting silver from liquid solutions

Details System for extracting silver from liquid solutions System for extracting silver from liquid solutions

1985-03-25

1986-10-28

Valentine, Donald R.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204269, 204271, 204273, 204109, C25C 700, C25C 120

Patent

active

046197494

ABSTRACT:
Ionic silver is extracted from photographic fixing solutions by electrolytic plating on a removably fixed cathode plate of an electrode assembly connected in series with a fixed resistor to a voltage source from which plating current is drawn. The plating current is correctively changed by detection logic in response to excessive variation in the electrolytic resistance of the liquid beyond a threshold limit established through a programmed reference voltage generator that is calibrated to match the chemistry of the particular liquid being electrolytically processed.

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patent: 4263108 (1981-04-01), Berg et al.
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patent: 4319971 (1982-03-01), Good et al.

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